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High precision technique of measuring the reflectance of reflective materials

A new method of reflectivity measurement is proposed and tested in this Ph.D. study. The method employs fast rotating reference mirror and certain geometry configuration to alternately deliver the light via a sample mirror or by passing it to a photo detector. It has proved to reach a precision of 2...

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Main Author: Lim, Boon Han
Format: Thesis
Language:English
Published: 2001
Subjects:
TK Electrical engineering. Electronics Nuclear engineering
Online Access:http://eprints.utm.my/id/eprint/6816/1/LimBoonHanPFKE2001.PDF
http://eprints.utm.my/id/eprint/6816/
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spelling my.utm.68162018-09-27T04:03:51Z http://eprints.utm.my/id/eprint/6816/ High precision technique of measuring the reflectance of reflective materials Lim, Boon Han TK Electrical engineering. Electronics Nuclear engineering A new method of reflectivity measurement is proposed and tested in this Ph.D. study. The method employs fast rotating reference mirror and certain geometry configuration to alternately deliver the light via a sample mirror or by passing it to a photo detector. It has proved to reach a precision of 2 x lo4 reflectance unit. The precision is at least ten times better than that of conventional reflectometer used in solar energy applications. With good repeatability, the durability test of mirrors is camed out for only one month enabling significant specular reflectance losses of mirrors to be observed instead of more than a year in the conventional case. The reflectometer has provided solutions to few problems that limit the conventional reflectometer. Firstly, the time interval between the collection of reference signal and sample signal is short, therefore, this can reduce the effect due to the changes of environment conditions, particularly, the intensity fluctuation of light source and others. Secondly, by taking advantage of the short measurement time, a large number of readings can be made to suppress the noise level. Thirdly, the value of the reflectance of the reference mirror is not required. In the system, an accurate positioning of laser beam on the photo detector is achieved by a position sensor using a pair of dual cells that acts as an optical lever as well as a position transducer for the feedback system. 2001-10 Thesis NonPeerReviewed application/pdf en http://eprints.utm.my/id/eprint/6816/1/LimBoonHanPFKE2001.PDF Lim, Boon Han (2001) High precision technique of measuring the reflectance of reflective materials. PhD thesis, Universiti Teknologi Malaysia, Faculty of Electrical Engineering. http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:62394
institution Universiti Teknologi Malaysia
building UTM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Malaysia
content_source UTM Institutional Repository
url_provider http://eprints.utm.my/
language English
topic TK Electrical engineering. Electronics Nuclear engineering
spellingShingle TK Electrical engineering. Electronics Nuclear engineering
Lim, Boon Han
High precision technique of measuring the reflectance of reflective materials
description A new method of reflectivity measurement is proposed and tested in this Ph.D. study. The method employs fast rotating reference mirror and certain geometry configuration to alternately deliver the light via a sample mirror or by passing it to a photo detector. It has proved to reach a precision of 2 x lo4 reflectance unit. The precision is at least ten times better than that of conventional reflectometer used in solar energy applications. With good repeatability, the durability test of mirrors is camed out for only one month enabling significant specular reflectance losses of mirrors to be observed instead of more than a year in the conventional case. The reflectometer has provided solutions to few problems that limit the conventional reflectometer. Firstly, the time interval between the collection of reference signal and sample signal is short, therefore, this can reduce the effect due to the changes of environment conditions, particularly, the intensity fluctuation of light source and others. Secondly, by taking advantage of the short measurement time, a large number of readings can be made to suppress the noise level. Thirdly, the value of the reflectance of the reference mirror is not required. In the system, an accurate positioning of laser beam on the photo detector is achieved by a position sensor using a pair of dual cells that acts as an optical lever as well as a position transducer for the feedback system.
format Thesis
author Lim, Boon Han
author_facet Lim, Boon Han
author_sort Lim, Boon Han
title High precision technique of measuring the reflectance of reflective materials
title_short High precision technique of measuring the reflectance of reflective materials
title_full High precision technique of measuring the reflectance of reflective materials
title_fullStr High precision technique of measuring the reflectance of reflective materials
title_full_unstemmed High precision technique of measuring the reflectance of reflective materials
title_sort high precision technique of measuring the reflectance of reflective materials
publishDate 2001
url http://eprints.utm.my/id/eprint/6816/1/LimBoonHanPFKE2001.PDF
http://eprints.utm.my/id/eprint/6816/
http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:62394
_version_ 1643644647275233280
score 13.211869

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